Beyoncé celebrated her twins Rumi and Sir's fourth birthday on Sunday.

The The Grammy Award-winning singer, 39, shared a brief message in honor of their special day on her website.

"What's better than 1 gift... 2," the message read. "Happy birthday Rumi & Sir."

Beyoncé and her husband, Jay-Z, welcomed Rumi and Sir Carter on June 13, 2017. They are also parents to 9-year-old Blue Ivy.

In an interview with The Sunday Times, published in April, Jay-Z spoke about how they parent their three children.

"Feeling loved is the most important thing a child needs, you know? Not, 'Here's this business that I'm going to hand over to you, that I'm creating for you,'" he shared.

"What if my child doesn't want to be in music or sports?" he told the outlet. "I have no idea, right? But as long as your child feels supported and feels loved, I think anything is possible."

Beyoncé's father, Matthew Knowles, also posted a birthday shoutout for his grandchildren on social media.

"Happy Birthday Rumi & Sir! Grandpa loves you!" his message read.

Beyoncé is notoriously private when it comes to sharing photos of her children. She did give the Beyhive a rare glimpse on Instagram of some sweet family moments earlier this year.

Check out the snaps she shared from a March trip to Malibu with her loved ones here.